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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 Contract | Mar. 31, 2012 Contract
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 16 |
Extend Maturity | $ 433 |
Modify Rate | 481 |
Modify Payments | 530 |
Total Pre-Modification Outstanding Recorded Investment | 1,444 |
Post- Modification Outstanding Recorded Investment | 1,321 |
Specific Reserve | 0 |
Commercial, financial, agricultural and other [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 2 |
Extend Maturity | 426 |
Modify Rate | 0 |
Modify Payments | 12 |
Total Pre-Modification Outstanding Recorded Investment | 438 |
Post- Modification Outstanding Recorded Investment | 377 |
Specific Reserve | 0 |
Residential real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 9 | 2
Extend Maturity | 7 | 0
Modify Rate | 214 | 97
Modify Payments | 514 | 0
Total Pre-Modification Outstanding Recorded Investment | 735 | 97
Post- Modification Outstanding Recorded Investment | 677 | 53
Specific Reserve | 0 | 0
Commercial real estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 1 |
Extend Maturity | 0 |
Modify Rate | 244 |
Modify Payments | 0 |
Total Pre-Modification Outstanding Recorded Investment | 244 |
Post- Modification Outstanding Recorded Investment | 242 |
Specific Reserve | 0 |
Loans to individuals [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Number of Contracts | 4 |
Extend Maturity | 0 |
Modify Rate | 23 |
Modify Payments | 4 |
Total Pre-Modification Outstanding Recorded Investment | 27 |
Post- Modification Outstanding Recorded Investment | $ 25 |

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